Kiwifruit Psa
What is Psa?
Pseudomonas syringae pv. actinidiae (Psa) is a bacterial disease of
kiwifruit vines, first identified on New Zealand kiwifruit orchards in November
2010. Psa carries no risks associated with human or animal health, and it does
not affect plants other than kiwifruit vines.
What effect does it have on kiwifruit plants?
Early symptoms of the disease are brown, angular leaf spots, sometimes surrounded by a yellow halo, and leaf curl. In some cases in Italy, the bacteria has entered the cane of the vine causing visible cankers and can result in vine dieback or death of the plant.
Early symptoms of the disease are brown, angular leaf spots, sometimes surrounded by a yellow halo, and leaf curl. In some cases in Italy, the bacteria has entered the cane of the vine causing visible cankers and can result in vine dieback or death of the plant.
How
does Psa spread?
Psa is
a transmittable bacteria, which means it can be carried via heavy rain, strong
winds, on equipment, machinery, people and plant material.
What effects has it had on kiwifruit markets?
The disease was first seen on green kiwifruit vines (Hayward) in Japan about 25 years ago and on green kiwifruit vines in Italy in 1992. In recent years, outbreaks of Psa have devastated the industry in the northern Italian region of Lazio, including wiping out a New Zealand-owned gold kiwifruit orchard in the region. The disease has been estimated to have cost Italy around two million euros. The disease has had different impacts in different environments - Psa is present in Japan and Korea, however the disease is controlled. New Zealand Plant and Food Research say the impact Psa has depends on the environment and also how it is managed.
The disease was first seen on green kiwifruit vines (Hayward) in Japan about 25 years ago and on green kiwifruit vines in Italy in 1992. In recent years, outbreaks of Psa have devastated the industry in the northern Italian region of Lazio, including wiping out a New Zealand-owned gold kiwifruit orchard in the region. The disease has been estimated to have cost Italy around two million euros. The disease has had different impacts in different environments - Psa is present in Japan and Korea, however the disease is controlled. New Zealand Plant and Food Research say the impact Psa has depends on the environment and also how it is managed.
What does it mean for New Zealand?
This week's discovery of Psa at a Te Puke orchard is the first time the disease has been found in New Zealand. The strain of the case found is yet to be determined, as is how it got into the country or what sort of effect it will have on the plants here. Kiwifruit exports are worth more than $1.5 billion to the New Zealand economy.
Here are some images I could use to show this information:
This week's discovery of Psa at a Te Puke orchard is the first time the disease has been found in New Zealand. The strain of the case found is yet to be determined, as is how it got into the country or what sort of effect it will have on the plants here. Kiwifruit exports are worth more than $1.5 billion to the New Zealand economy.
Here are some images I could use to show this information:
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